Symantec BackupExec 12.5 Unknown Errors on HP Server

After installing Symantec BackupExec 12.5 on an HP DL380 running Windows Server 2008, the backups at one client were failing partway through the backup with this error message: 
Backup started on 3/22/2009 at 3:18:16 PM.
Backup Set Detail Information
Storage device “HP 1” reported an error on a request to write data to media.

Error reported:
A device attached to the system is not functioning.

V-79-57344-34036 – An unknown error has occurred.

Normally I would suspect hardware, but the same tape drive and SCSI controller worked the night before running BackupExec 11.0 and Windows Server 2003 prior to the upgrade.

The client called Symantec, and he was escalated to Level 3 support without a resolution before I had a chance to look at it.  Thankfully, my “Google-Fu” was strong that day, because I found this:  http://seer.entsupport.symantec.com/docs/305233.htm

Turns out there is a known conflict between the HP Server Management Agent and BackupExec.  Funny thing is, it does not appear to be consistent.  Some combinations of BackupExec and HP Agent versions work, some don’t, and I haven’t been able to figure out any rhyme or reason to which ones may or may not work, or why.

 Hope this helps;

James

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